Pump.



0. L. GLASER.

I PUMP.

APPLICATION FILED APR. 26, 1915.

LQQfiM. Patented Dec. 26,1916.

2 SHEETSSHEET l- Ins Egg

0. L. GLASER.

PUMP.

APPLICATION FILED APR. 26. I915.

1 ,2U9fi33. Patented Dec. 26, 1916.

2 SHEETSSHEET 2- tion.

larger than the stroke,

OSCAR LEROY GLASER, 0F OAK PARK, ILLINOIS.

PUMP.

Specification of Letters Patent.

Patented Dec. as, rare.

Application filed April 26, 1915. Serial No. 23,806.

/ To all whom it may concern:

Be it known that I, OSCAR L. GLASER, a citizen of the United States, residing at Oak Park, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

My invention relates to improvements in pumps, and has for its general object to provide an improved and efficient air pump as may conveniently be used. for the inflation of automobile tires, as well as other uses.

Among the objects of my invention are to provide a construction that is simple, cheap, durable, efficient, easily repaired, effectively lubricated, and positive in its pumping ac- Other objects of my invention are to provide a construction that will operate effec tively at low shaft speed, and handle a large volume of air in proportion toits size.

In the drawings wherein I have illustrated an embodiment of my lnvention Figure 1 is a vertical cross section of a pump embodying my lnvention; Fig. 2 is a plan view thereof. Fig. 3 is a vertical cross section on line 33 of Fig. 1 and Fig. 4 is a transverse section on line 4-4 of Fig. 1.

The pump shaft 10 carried by bearings 11 and 12 in the side walls of the casing, carries a cam structure 13 that coacts with a roller 14 carried by the pump piston 15, a spring 16 holding the roller constantly in contact with the cam. The piston works in the cylinder portion 17 of the frame structure 18 that has, opening to a cylinder clearance space an outlet port 19, and inlet ports 20 and 21. The pump structure is preferably condensed irfheight, and constructed with a cylinder portion having a bore much the relation shown being somewhat more than 3 to 1.

The upper portion of the casing 18, in which the piston reciprocates, with radiating ribs 23, preferably horizontally disposed, but stopping short of the end of the cylinder, the end of the cylinder portion beingexternally reduced and screwthreaded as at 24 to receive the head or cap 25 in which the ports 19 and 21 are located; Said head is provided with radiating ribs 23 at its sides, and across its top is preferably provided with' further ribs 23" that radiate fromthe centrally located boss 19 through which port 19 is made. This boss is chambered as at 26 to contain a ball valve is provided,

the level of the main 27 for closing, inwardly, the port 19, inward pressure being eXerted'on the valve by spring 28 that bears against the nipple 29 threaded into the end of the boss and itself having a threaded orifice 29 for connection withan air pipe. A valve for the intake port 21 is reversely arranged, boss 21 suitably chambered, being provided with a nipple 31 in which is formed a seat for ball valve 32 pressed outwardly by spring 33. The intake ports 20 are preferably made at intervals all around the cylinder, at substantially the lowest level reached by the piston in its stroke.

The cylinder frame 18 preferably continues downward of uniform diameter below the bearings 11 and 12 and shaft 10, and is provided with bosses 11 and 12 for the respective bearing bushings, boss 11 being preferably arranged exteriorly to the cylinder and boss 12 interiorly of the frame, the shaft continuing to the exterior of the device on the first mentioned side and stopping in the bearing 12'. Below the bearing the cylindrical frame is preferably reduced in diameter as at 18 to form an oil well 35 that is closed at its bottom by a screw cap 36, and cleats 37-37 are provided, with bearing surfaces below the cap 36, and with bolt openings 38 suitably formed therein, for support of the structure.

The piston 15 is preferably made hollow, with inwardly projecting lugs 15 flanking the roller 14, and affording bearing for the roller shaft 40 that on one side preferably projects in an extension 40 through a slot 41 in the side wall of the. frame and into a spring chamber 42. The side and end walls of the spring chamber are preferably cast integral with the frame, and a removable cover 42 is screw fastened to said walls to close the face of the chamber. The spring 16 has one end connected with the groove 44 in the shaft extension 40', its other end being connected to a boss 45 at the bottom of the chamber, which is preferably below shaft 10. An oil duct 46 preferably leads from the bottom of the spring chamber into the oil well 35.

The cam 13 coacting with roller 14 is preferably made with three lobes 13', each having its surfaces conca-vely curved at their sides and rounded at the top so as to tend to maintain the contact point between cam and roller close to the lowest point of the roller for direct application of thrust, and

shaped to give the piston, through the roller, pin, a cam on said shaft contacting with a gradual rise in the early part of its inthe roller, and a spring positioned outside stroke, and more rapid displacement at the of the cylinder and secured at one end to ishing portion of its instroke, with a rethe projecting end of the aforesaid pin to versal of this action as to the outstroke. maintain the roller in contact with the cam.

For purposes of lubrication a body of oil is 3. In an air pump the combination of a maintained in the chamber 35. frame providing a cylinder portion, a cham- It will be apparent that each rotation of her below said cylinder portion, and an exthe shaft 10 will result in three reciproca ternal spring chamber, having communications of the piston, giving, on account of tion with the chamber below the cylinder, the large bore of the pump, a great voluthrough a slot 41, a'main shaft, a camtheremetric displacement of air. On the piston on, a piston, a roller for coaction with the instroke the compression, augmenting as the cam, a shaft connecting said roller with the piston rises, lifts the valve 27 to force air piston and extending through said slot 41 out through the orifice 29, the rapid rise into the spring chamber, a spring in said of the piston near the end of its stroke givchamber acting on the shaft extension to ing an impulsive quality to the final air demaintain the roller in contact with the cam, livery that is very effective in overcoming and -a removable cover plate for said spring the resistance that is offered by an almostchamber. 1

inflated tire. The multiple lobe cam, work- 4. A large bore, short stroke air pump, ing in the oil containing chamber, efiects the operating parts of which are completely an adequate splash lubrication of all the inclosed, comprising a one piece frame, working parts, such surplus oil as splashes open at its lower and upper ends and prointo the spring chamber returning to the viding in its upper end a cylinder, a piston oil well through the duct 46. On the outreciprocable therein, a cylinder head sestroke of the piston the valve 32 opens ur d on th upper end of the frame, a promptly to admit air, in order that the closure plug secured to the opening in the spring 16 may not be working against the lower end of the frame, opposite shaft bear.- vacuum tendency materially resisting the ings in the side walls of the frame, a return ofithe piston, and when the piston straight shaft of uniform diameter jo-urreaches its limit of outstroke, the opening naled in said bearings, a roller carried by of the extensive area port 22 completely fills the piston, a piston actuating cam mounted the cylinder with air, so that even if the o the shaft for engagement with the roller speed of operation of the pump has required and means for maintaining the roller in enadmlsslon of air in excess of the capacity g g nt with th am.

of port 21, the displacement of the full 7 5. A large bore, short stroke air pump, the volume of air on the next instroke is asoperating parts of which are completely insured. closed, comprising a one piece frame, open Having described my invention, what I at its upper and lower ends and providing claim 1s: I in its upper end a cylinder, a hollow cup 1. In a pump, a caslng having acylinder shaped piston reciprocable thereln, a cylin- -port1on at one end and an 011 ,well portlon der head screw threaded over the upper end therebelow, a main shaft traversing said of the frame, a closure plug screw threaded casing between said portions,amultiplelobe into the opening in the lower end of the cam on said shaft, a piston 1n.the cylinder frame, opposite shaft bearings in the side provided with a roller for coaction with walls of the frame, a straight shaft of unisaid cam,- a spring chamber external to said form diameter journaled in sald bearings, casing but in open communication therea roller journaled within the cup shaped with, there being an oil return duct from piston, a roller actuating cam mounted on sald spring chamber to said oil well 'porthe shaft within the frame, whereby the tion of the casing, and a spring in said'caspiston is reciprocated by rotation of the ing acting on said piston constantly to shaft and means for maintaining the roller maintain it in coaction with its ca in ngag ment with the cam. p

2. In a pump the combination of a cylin- In testimony whereof I hereunto siet my der, a hollow cup shaped piston therein, a hand in the presence of two subscribing wit- 1 pin mounted at its end portions in opposite nesses. 7 walls of the piston and projecting at one OSCAR LEROY GLASER. end through a vertical slot in the cylinder In the presence"of -wall,-a roller Journaled on said pin within G. T. PERSSON,

the piston, a drive shaft parallel with said J. F. BLYTHING. 

